c ++用鼠标在图片框上单击绘制一些东西

Question

我有两个图片框功能。我想用鼠标点击图片框画点东西

private: System::Void pictureBox1_MouseClick(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e) {
        int Curx = e->X;
        int Cury = e->Y;
}

和

private: System::Void pictureBox1_Paint(System::Object^  sender, System::Windows::Forms::PaintEventArgs^  e) {
            e->Graphics->DrawEllipse(Pens::Blue, 200,200, 1, 1);
}

我想在另一个中使用一个功能。

Answer 1

在定义了图片框的代码的 private 部分中，为位置添加两个变量 x 和 y，如下所示：

private: System::Windows::Forms::PictureBox^ pictureBox1;
int mousex;
int mousey;

设置您的 MouseClick 事件以将坐标保存到这些变量并通过调用 Refresh():

强制重绘

private: System::Void pictureBox1_MouseClick(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e) 
{
    mousex = e->X;
    mousey = e->Y;
    pictureBox1->Refresh();
}

在 Paint 事件中，在 mousex 和 mousey 中保存的坐标处绘制椭圆：

private: System::Void pictureBox1_Paint(System::Object^  sender, System::Windows::Forms::PaintEventArgs^  e) 
{
   e->Graphics->DrawEllipse(Pens::Blue, mousex, mousey, 60, 60);
}

调整椭圆的宽度和高度，目前各为 60，供您选择。

c ++用鼠标在图片框上单击绘制一些东西

c++ draw something with mouseclick on picturebox

c++-cli

winforms